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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aed3e0f46286ff63477cafef8b03fe7cd7890a5afe2a0804cff3ae737127772' 
  AND token = 'PTvn2cw2TKtdcZg4oAEn1vGSorxAW0ni5XsIrZRN5ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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