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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45688bb69a5ec9747f29c5e08ec7ceaa7b4a228ab9986a92e06c9e2bbcebd5a5' 
  AND token = '6oPIwZGt86XoTFhKyWSztfeKZi1pjrBJexwQ4wzCu50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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