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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd798f79cf25c362ab8ad190fe4fc62403a65661df4d4d83c1e22648a763c44be' 
  AND token = 'WcXhX9fXgMtVEI1TVCtIHS3GVv6l4JyJ4MsS3QxUxk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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