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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fbe6d96dd798d09abedf9535aae8e2c589a3748bafdebe0dc99a4521ed8c807e' 
  AND token = '8gH7d7MHSPkJrXV4/v3qikUbpr4dlZPPOzxDuxyAj+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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