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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efdeba2ece73934f88f5be5c80f170facd87d6520a11bb72a84cabb7174b6ad0' 
  AND token = 'ZisYsgbyWynLC/dIgop0X/+wbw14Yss0/U+7muXJQdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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