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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a5becf578063f558c5b25d25a4ddeaeae4c3fad98f3b41a859f79f18f9bfadc' 
  AND token = 'EKj9Ce8xdkcHgEOplTdMbycBi9mvljrmSCHJbApGrL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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