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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c03b3cad3a95ad2e54814dd4e383d46c457e758b0001992538d9d392bb9debaa' 
  AND token = 'HCTXn1aOR5Dl1ypg7S0usolcPFNxtDgPXYZ9HJq42H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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