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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dae2ca2574929bdee83b54df5bd393f0187e038ba0fc929bd5c897f2ede1a9d7' 
  AND token = 'Bw341oltXueyj9lbyTK36mVuZR8GwlZmx31CCHGowDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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