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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b155dd2805baa3d5bda271684bb3d8ae7686a72b53f4f5e37f40cdb46ea15a83' 
  AND token = 'I54CdzTOHiViwn6Lon4yDjG4gnbrOOgXog5CVGHhkZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}