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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10892ea51087bbd98b1e1e4a26d0b29d88dde0c4b11ef4ed86c06149922351bf' 
  AND token = 'xl6Y8gicHj7SRU2Zct587FhkZACYVlMnjHsyBDGs/Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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