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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7634c9cefd136db213b7093596f8393e7e3aae9c7314ede58ad79dddb4e78d20' 
  AND token = 'SHg8RkiBqp1qHJuTHMLCaJE40pTkMnnL8qLjHxuGIxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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