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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac3f35eb8e87255bb54aec5d4052dc4acf7601c1a5b270be64454920ca40aa4f' 
  AND token = '5avCQ5EcO2yntFBE7S6tP+Nt1Avg9dJEnfGWad2quPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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