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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc4c5ed29a77e175f7457e65292b0914c28e8a9ea72203b97c9f5945e11858b3' 
  AND token = 'KMux8qgc/pslYHgwTUabI3SsLc5+4AiLBHQdfRawvN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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