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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0f349ab94d364e26092f9d9ad640fca0c223e10b7cd90938a16582e87005c10' 
  AND token = 'xHjQhH/DKao/7YcLq5VQoEfjKUNQawHEXm0wwreQtcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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