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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9503c8093a6c4b10c5300c0c9a61cae5de501d22104e4a4fd9e6b73a3fdc5867' 
  AND token = 'VaFlr7XC6dtZ1Sqeb6OuWmbfIk4DTI3MGJMC3OJNWrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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