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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47a67f982a208632e7e55b0ce4139e7d20b2967dc7399fe318b8e9369d0ecb90' 
  AND token = 'pvWuWP/4eX2vlCc9OlvAbaYYjJ2Ho6nXHmY06jAatIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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