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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e7057cc90c2c6b575aca66637fe0d1f00b37dc36fe5cf016c7b312228ee4f5b' 
  AND token = 'FByUea1CRW5PuRvcYdL8bR8HlVNrhWIQho/VWIpQMqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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