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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38f45e4c30406ee1a3bcf7b1cac3cae65784695f8bc05c96c3e0e1cdd71e896b' 
  AND token = 'RY3fHGvRgiPFnSYIwUANvDzuQ5w3dqGpgHNRPxAr2mM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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