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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c0e20b017ac7baec622b3978f0d3ea01f682d4687b0b60a9b67c8bbe1e7c94b' 
  AND token = '5FbQqttc4BJNVuOBRE59lwn2B7QFNEPoR7R/lXyu0iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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