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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '602bf64c6a45ab8feb9c0822b2cf7de9576a1e523fbaa96eb9590ab4eea07b8c' 
  AND token = 'URYdobJLKkiWyCf+fpgKORy7UyQh6UehzyWKKlYOQu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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