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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ad7ce3e3933db5275c1b43205b6abb590a4ce9ac8d6202f86a6f86aab1b6418' 
  AND token = 'rM/kdhQnkr4hMKsU3UfFc37MFP57FoXs38rPXPg2zls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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