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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f8d85691faa278c2ea24fea3e4cb31d28163fe2ddd02262d7e98212303fefe8' 
  AND token = 'H5KlntY8XnK23pNMxdJiQEtl9Se+qAL0dWp6zIQyqEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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