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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a92ca1a42b1d0720b38e8a607a31abef01770189fbe16c69ff7c32559a03d704' 
  AND token = 'fUhjaQ5pCtiLgLO3TYQMnQinaahiVUcIyMgNSNYeFSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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