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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ef6f91cf3f97c6b5b1d024508fce362a6d14bfe17828e9e57aa0bbd8f19695f' 
  AND token = 'C8fqEbxAntkfaYNcKX/9XgeYzWjCinkTtuwjTOFRpys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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