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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c2916176d0e945744996609af78addeb03e41aded283317ec814f9b09fb6693' 
  AND token = 'r9Ugh46nse1PuNWhTk3kY3wZ+hjXXcG818iL+X+DCec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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