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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02da795050667358fbc1f176299553070951e3b3efaa9fc997021b8caf986a5f' 
  AND token = 'whetcgOeAB49txHLu1mBuTawdcrrbRKaEW7NI080KDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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