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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a486e422f3995dd378b1f7b1463bcb0e9d22769213dcacec1a9059b6ee86c53b' 
  AND token = '7Hl3DAsUxFHtZXFka4Ax3bEMxhe5lQQOdUQwNvPVZoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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