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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5bb2755dbc68811fd72b33e88a6d659b511be5c2e4c1537efe0d75bd8f2279c' 
  AND token = 'ZdqQk0/f67eOtIfv8viReX8FZp/TJQoapDgCL5cwBJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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