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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b8819ef7f0567438381e0859c763197e31ee233804c2adad7cf0e5e1a550e19' 
  AND token = 'KrlQL+nOlruA2UvzjfwFt6YfSYOWKyN+R6aMCmfyfwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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