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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2f6eb453377211b8bfaf2b41d98e7e8cd32d9c7a2176fbde7c18d046a11ec5f' 
  AND token = 'kWX+LcOrm+dDkjU+zOJ9fvuC3ONyMMOvOOB+kqyopIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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