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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e47981154ff8a9739a1d11c9e6bf41f798a78fb36d7a49c2a1e1df5df391bb52' 
  AND token = 'it7MLOUZdEWyDRlfvF/w/lU87FMok/4M/nlO6FY/AtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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