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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bebec889d8e9639187e77e1a0319bf1d159b7449d388398dbf54d934a8ccb041' 
  AND token = '4aox7Pewxdbv/QWo/UCiGaXtIO0jciqntMv+APzaso0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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