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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0a0aea019fe62b96cf50d27bfcb62b024cc7a2946c3e48aa50c79decfa5cf64' 
  AND token = 'hQGkJiR3FqmRkECSo5K2nP65JxfdHDRm2sUjrGyMRWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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