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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0d2eeaae150e974e6775077f8707bc62f35ed29972806830203d163696d1ee53' 
  AND token = 'tIVFT4uuWtsENygS4XdGa9mVYVpfy1XRoVpQ5TXagg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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