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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc28ad5535d0188b43fcd419ec4d88585009ed9b3bed76d87f5e80d99e0a499e' 
  AND token = 'urbVfyH5+2RCVZKbXp/Np/4dtN1NfZo4DMXI3FIxS/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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