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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5cd74768c7b5579c92b3b1aed6f350be7e54d7e74f0422a2d1b95f5d3f64cd6' 
  AND token = 'eNFhODi3An05j3Hf6yT7EMPS1jeDCG6P/PXwJqEnNLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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