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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c41b66428ac342b08d94d82b447a28867975874b68aab32ebbd400ecf179c3e' 
  AND token = 'Ca1QA5bdwQ+aD1MGx3s3Qp8/uPWB0jBUP/c/tCL8YRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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