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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c162002f8a58c67fe36dbf9b640e0b305526583587fbc5e7b97a50ced6cfe170' 
  AND token = 'p5OrE3LRtkNFrN1SBoHY19acwxGGbmfp2zfP1atIY50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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