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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e2e9fb2f2e8951f05913cd3d2180982982b774efa5cd4cd07ced87ccbe4103b' 
  AND token = 'GOtPvM2WUuS5WbqEiGxoQeZlUXgnBXm9jIb70Fs/8RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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