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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36e64f80216c038b7a352389b81caa55e5f5b1e6aa6c28079f30ff21afc7927e' 
  AND token = 'DysAAzjmcjuchP6qCaFShpTUbHHiNBGGsqWcIWxx/rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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