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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b00a50b2b09d5fc580cd449710bb7cdf5b84d3539a84d0803c9e0a97ba4eac8c' 
  AND token = 'QWmb8lCscz0SPE0TLq/9E8dsZWKJ6zvcb9sfiD3ml50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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