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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1f248cd1399fe16cdfabdd6f02b4d31a911b432d7e04c7961ce41482f60bc89' 
  AND token = 'A13DPvoes50V+pHQc7JQpf5LMZ4PDK/qMLnyFrC+YQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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