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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5aea70d9d462d6bec60e496ddb45a9565e7a9a551ecf567b9df57a898df5d4e8' 
  AND token = '3CPPGCsCid1xItzY57+eZodJSpTlDp5kqr0/qiJVpXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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