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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abf2c6eaec0a3f644ee16ce285d042a6b91574a0622fc4205235d88d2ecfbed7' 
  AND token = 'tDALEhqUErQp0R7EdlzeUV1eWlKYkcpKIOi2UOY25U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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