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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b5c7278a5cbc478089f16bd2a5f6495e6c470b0b779bc55869477cb73e9815d' 
  AND token = 't2HeCUF7MiKdoYy8o1pMifYxkjcoCRVea/HHLmAUkG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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