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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c779b9382fd53004bae8e06a4619624a11a000eea553cca02ed76646c1196ab2' 
  AND token = 'ZnNC7pZxYBc6uI56TB2J967m8+Hju2fWKarlkZCKYCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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