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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '861767953a4980da46955d3d7ed57f4856d4bc46663b3936fe6ec5c8280c7a29' 
  AND token = 'st6xJ8gybgaq9cvaDCAMtSLWb5g2L2XLb392Xp+3Ptk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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