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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5cd409918cc25d5c2b3a7aefeb1213d6e2c936155d37675ca5dd82d35ef1b1aa' 
  AND token = 'FTqTDRb5uuAtVLQwF4eC+kWq6saj/2b8SrZ+EKmcCB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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