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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f39fe3855b6b72058619e9547bf9d0678cc1162e7e0dc8c221c0e6c13966a2f' 
  AND token = 'PfRO5L77WyQw56JfALTsoLJZrsV7PbBalhwBFQUu3rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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