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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '076fb8a538bc1c8d940c1700f7e307e106bca1d8e1b3f5662f38233aecf1840f' 
  AND token = 'n8Il6lNH5Jr+v19rdKbwhqSzFY3O3O3NcslDHk6V6zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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