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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'faa37c1d27efe6bf8f4c7693b7c1a2d2b892d3c0f74fb40729b7e4ca985a156a' 
  AND token = 'jHZeoAW4XwTxQr0GfYaM2qdG79lhulG0UXnoPk9Wj3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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