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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12594ab6b3e8e00c8f068b294b689ebbb6133844b028a1fecdb95cc0a8888d19' 
  AND token = '3/JcXBwbtZkquvLnWTSALWur3IvRU6dkxK64X369SVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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