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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c81e57f59964fc34253d4d170828777732c41449cf33c02ad52b211f6f57efa' 
  AND token = 'uaryOYflevN8nIvh/j+C6okadDbhWNAkhyw6YNEZfNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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