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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19a23ce0e92b79a9b8ee43e5f3e109d017d0c8a102b72c8889f6ab273066d531' 
  AND token = '2t1zV5gc/k2PcjTaxD31n+w5Q4c6ccjBGyhk0hLMrls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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