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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '214ca4c7c68f37f42d12236212445b2193cae026b384ebcf0844e0d48ecc18dc' 
  AND token = '5P+nwzp7oRl2iKLjfboAaFuL3RLO3NgJ3TzQQGMerXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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