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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '87611e5068d691749c4207bbcb106c6c1384b4a3e7f3c68f7b27bcea78a96c73' 
  AND token = 'nt96s9L8IAE3QsNS4xk6dAod3KcVi+M+uK3j8eMbP1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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