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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25538c1b19b8d16b24ddd59a40db795de74793eb275b7e4c5f3cfbe38f21e805' 
  AND token = 'l8VS8fWB0PYaRTgEdVAunrO5TKFl8yXQObg4QfkABJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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