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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2c38c38db785076d2b6192e87476a4d9e3305f58371abdd4b2da7d961082a573' 
  AND token = 'JKTWSnMYrK2mWnYVmzbeZk3dv4h4rw3Pb2kdTXd6Oxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00209

JSON explain

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