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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f02fe3ab7a14e75e99bfe3fa28c87da7f4ccf0f66b87f8a9e9570ac09b48af88' 
  AND token = 'TClYu4jFj+n/edEWDLEMvtc0jgGgvoqd6z2TH2E0z+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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