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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7709d50dcdf7a0bd8c9798933a39af85396d3c00fff22c8ac7ce5d31e39d3bd2' 
  AND token = 'yk6QESFuKjeMLvSwZ3AylTta9Ma3rc98xIfW4sMj1wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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