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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b22f1140c68e5b067802ade8a1c3a27b7a43bd12a206e63966ab241a1c45d64' 
  AND token = '84SwFjCMJfhyQJK3lyUZHYPnVyx3t7aIIcf0D7X2J2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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