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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fa2f93374dc1e4b2bb2caebfe3ff85b7d0c6af3ab39fb66bdce1322fa96af8d' 
  AND token = 'J6RXnUpzPsa8o53T758kHVeIosaj2CYvamu44dt43Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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