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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '560c6b4a01518bde3418b27d67d9c0c5ee51d93b0d98a064039af8ff2ac5f3d4' 
  AND token = 'DU+vbyS3sLRtN6KtbKSK/aXT3X8/kqQYxL7EjE9FDhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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