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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad4523c407925963c3e3b4e4521e830a9adc14ed525d750ff3b6cb8088b99da4' 
  AND token = 'yR8E7LYExhtgBneCI8CzglHCzXXawN2wB5AwdWyDMUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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